Voultar wrote:90 degree routing and a total lack of ground plane.. Eek!
I had never considered that the copper plate served any purpose besides easy access to ground.
Now I know (that its to absorb interference) and knowing is half the battle.
I am also assuming that you get some antenna like effects from the 90 degree angles ?
At any rate I already tested this board and haven't seen anything as far as noise.
I also don't know what frequencies are propagated inside of the coleco or if they are even high enough to be relevant.
Then again my eyesight is going and I only have a normal CRT. I am just trying to take the random scraps of information on certain mods and put something open source out there that anyone could pick up and use ¯\_(ツ)_/¯
I accept that it is clearly good practice to have a ground plane and better angles. I will re-do the boards I have done so far and have a dump of them (about 10 in total) in the very near future. On here and maybe a few other sites.
Thank you very much.
Update : Links above have been updated.
All my boards have had a ground plane added.
I was reading up on sharp 90 degree traces and it looks like the biggest modern issue is reflected signals ? I think this should work fine since it was working fine before anyway. Also supposedly even vias count as 90 degree turns apparently. So now I have to minimize those.
Does anyone know if those diodes are necessary to get composite video from Luma and Chroma ?
